In sailing trials she beat three fast boats: the King’s barge, a large pleasure boat, and a man-of-war’s boat. This [Pg 153]“double-bottom,” also called a “sluiceboat” or “cylinder,” was later lengthened at the stern to make her 30 feet overall."
Interesting. Almost fits the B-Class dimensions
How many cannons could she carry? Long nines or eighteens?